Boiler



Nov. 26, 1929. G. w. BACH 1,736,898

BOILER Filed Sept 25, 1925 if atented Nov. 26, 1929 UNITED STATES PATENT OFFICE GEORGE W. BACK, OF ERIE, PENNSYLVANIA, ASSIGNOR TO UNION IR-ON WORKS, OF ERIE, PENNSYLVANIA, A CORPORATION OF EENNSYLVANIA BOILER Application filed September 25, 1925. Serial No. 58,531.

This invention is designed to improve water tube boilers, particularly with relation to the arrangement of tubes and passes of gases through the boiler. These features and other details will appear more fully from the specification and claim.

The invention is illustrated in the accompanying drawings as follows Fig. 1 shows a central vertical section on the line 11 in Fig. 2.

Fig. 2 a section on the line 2-2 in Fig. 1.

1 marks the upper front drum, 2 the second upper drum, 3 the rear upper drum, and 1- the lower drum. A first bank of tubes 5 connects the upper and lower drums, and a second bank of tubes 6 connects the front upper drum and the lower drum. A baflie 7 extends upwardly from the lower drum to the rear of the bank of tubes 5. A third bank of tubes 8 extends downwardly from the second drum to the lower drum and a fourth bank of tubes 9 extends from the second drum to the lower drum. A baffle 10 extends from the second drum downwardly along the rear of the bank of tubes 8 and a baflle 11 extends upwardly from the lower drum along the rear of the fourth bank of tubes 9. A bank of tubes 12 connects the third drum with the lower drum and a baffle 13 extends downwardly from the third drum along the rear of the bank of tubes 12. A bank of tubes 14 connects the drums 1 and 2 and a bank of tubes 15 the drums 2 and 3.

The furnace is in the form of a rectangular box 16 and has a combustion chamber 17 in front of the bank of tubes 5 and a smoke stack 16*" at the rear.

The principal feature of the invention is in relation to the tubes 8 which are bent forwardly from the tubes 9 to a point adjacent to the tubes 6 and the baffle 10 is arranged immediately at the rear of these tubes leaving a space to the rear of the baffle 10 giving access to the battle as through an opening 19.

The pass of the gases is from the combustion chamber, over the battle 7, through the tubes 5 and 6, downwardly through the banks of tubes 6 and 8, around the baffle 10, up wardly through the tubes 9, over the baflie 11, downwardly along the tubes 12 and through these tubes around the bottom of the battle 13 and upwardly to the stack.

The bent tubes 8 with the forward deflection of the baffle 10 reduce the dead pocket in the pass of the gases where they are the hottest and increase the travel of these gases in relation to the tubes and this is accomplished without the horizontally arranged deflector battles as are common.

What I claim as new is In a boiler, the combination of a front upper drum; a second upper drum to the rear of the front drum; a lower drum; first and second banks of tubes connecting the front drum and the lower drum, the second bank of tubes extending in approximately a direct line between the drums; third and fourth banks of tubes connecting the second drum and the lower drum, the third bank of tubes being bent forwardly and out of parallel with the fourth bank of tubes to adjacent to the second bank of tubes; a bafile extending upwardly from the lower drum to the rear of the first bank of tubes; a baffle extending from the second drum downwardly along and to the rear of the third bank of tubes; a third drum to the rear of the second drum; fifth bank of tubes connecting the third drum and the lower drum; a battle extending upwardly from the lower drum along the rear of the fourth bank of tubes; a battle extending downwardly from the third drum along the fifth bank of tubes; and tubes connecting the upper drums.

In testimony whereof I have hereunto set my hand.

GEORGE 'W. EACH 

